Adolphus a



(No Model.)

A. A. KNUDSON.

UNISON APPARATUS FOR PRINTING TELBGRAPHS. No. 304,007. Patented Aug. 26, 1884.

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ADOLPHUS A. KSUDSON, OF BROOKLYN, ASSIGNOR TO THE WESTERN UNION TELEGRAPH COMPANY, OF EYV YORK, N. Y.

UNISON APPARATUS FORPRlNTlNG-TELEGRAPHS.

I. I'EGZFZGATEON forming part of Letters Patent No. 304,007,

August 26, 1884-.

Application filed May 6, 1884. (No model.)

To all whom it may concern.-

Be it known that 1', ADoLrnUs A. 'KNUD- SON, of the city of Brooklyn, county of Kings, and State of Sew York, a citizen of the United States of America, have invented a new and useful Improvement in Unison Apparatus for Printing-Telegraphs, of which the following is a specification.

My invention consists in the employment of aradial rotating arm rigidlyfixed upon a type wheel shaft, and an armature-lever which, under varying current conditions of the mainline, is adapted to rest in the path of the rotating unison-arm or be removed therefrom. The unison armature-lever is controlled by electromagnetism derived from the main-line circuit and a retractingsprin g. The retract-ingspring is so adjusted that when said armaturelever is once attracted to the cores of the electro-niagnet the unison armature-lever will be retained in that position as well by short electrical pulsations or quick reversals of current as by prolonged pulsations, and when the armature-lever has been attracted to the cores of its electromagnet it will only be withdrawn by the retracting-spring upon a long cessation of current in the main-line circuit. The retracting-spring is also so adjusted that when the unison armaturelever is retracted from the cores of its electro-magnet it will not again be attracted until a prolonged impulse has been transmitted over the main line. XVhen it is desired to effect unison, therefore, in the several printing-telegraph instruments of a series, a unison-switch is depressed, which breaks the main-line circuit. .Thereupon the unison armature-lever is moved by its retracting-spring into a position to arrest the rotating unisonarin. lVhen the unison armaturelever has been thus retracted, a series of electrical impulses is transmitted over the main line of sufficient number to bring the rotating unisonarm around into contact with the unison armature-lever. hen itis thought that the rotating unisonarms have all been brought to a unison-point and there arrested, a unisonkey at the transmitter is depressed, which also arrests the transmitter at a unison position. Upon depressing the unison-key and arresting the transmitter a prolonged current will be sent to line, which will both look the escapeinents of the receiving-instruments and at the sametime withdraw the unison armature-1e vers from the path of the rotating unisonarms. The unison armature-levers being thus withdrawn from the rotating unison-arms, and the main-line circuit being again closed, the transmitter may be released by the unisonkey, when the transmitter and typewheels will, all in unison, resume their step-by-step oo rotation from their zero-points.

I will now describe my invention by reference to the accompanying drawings.

Figure 1 represents the escapeni cut and unison apparatus of the receiving p1int-ing-tele- 6 graphinstrument. Fig. 2 represents the polechanging apparatus and rotating arm of the transmitter. Fi 3 represents the unisonswitch, unison-hey, and a series of ordinary character-keys of the transmitter. 7

L is a main line embracing the coils of the escapeinent electro-magnets B B, the coils of unisonniagnet A, the springs o p of the auto matic polechanger, and metallic plates (1 r, main-line battery M B, and unison-switch H. 7 5

T is the rotating arm of the transmitter, mounted upon a shaft with spunwheel n,which .is under the constant influence of a'motor.

m is the pallet-yoke, to which are rigidly fixed the metallic plates (1 r, said plates being insulated from each other, and respectively connected to the opposite poles of the battery M B.

J, Fig. 3, represents one of the series of transmittingkeys for arresting the rotating arm T in different radial positions.

I is a unison-key for arresting transmitter arm T in the unison position.

0 is a unison armaturelever controlled by the unison electro-magnet A and retractingspring 3.

e is a backstop for lever G.

d is the rotating unison-arm, rigidly fixed upon the same shaft with the escapenientwheel 10, whose step-by-step motion is eon- 9 5 trolled by the armature D and an escapeinent of the ordinary form.

The operation of bringing the instruments to unison, and of enabling a resumption of their step-by-stcp rotation, all in unison with the transmitter in the process of printing, is as follows: If it is assumed that the typewheels of the receiving-instruments are not rotating in unison with the transmitter, the unison-switch H is depressed, as shown in Fig. 3, thereby breaking the main line L, and causing the unison armature-lever G to be retracted by spring 8 into the path of the rotating unison-arm d. At the same time the unisonkey I may or may not be depressed to arrest transmitter-arm T. Under this condition the type-wheels of the receiving-instruments may remain stationary, and the unison armaturelever in a position to arrest the type-wheels upon the resumption of electrical impulse over the main line.

To bring the rotating unison-arm into a unison position, the transmitter is first started to rotate, and then the unison-switch H is released to close the main line. lVhen the main line is closed, a series of short electrical impulses will be transmitted over the main line, and while the unison armaturelever C is not attracted to the cores of unison-magnet A, armature D is rapidly vibrated, and the rotating unison arm (I is rotated into contact with armature-lever O. A sufficient number of electrical impulses must be transmitted to line to cause all of the type-wheels to'be given at least a complete rotation, in order to insure unison in all of the receiving-instruments upon the line.

It is obvious that while the unison armaturelever is retracted to.a position to arrest the rotating unison arm, a prolonged impulse must not be sent to line before said rotating unison-arm has been brought to its unison position, otherwise the armature-lever 0 would be attracted from its proper position for effect ing unison. To avoid such difficulty it is therefore obvious that the transmitter must be started before the main line is again closed by the unison-switch, in order that only short electrical impulses may be transmitted before arm d has been brought to its unison position. After unison has been effected, it is only necessary that the unison-key I be depressed to arrest the transmitter at the unison point. The arresting of the transmitter at the unisonpoint causes the transmission to line of a proson armature-lever, a unison-switch for opening and closing the main-line circuit, and a unison-key and transmitting-arm for the purpose of arresting the transmitter at unison, substantially as described.

2. In a printing-telegraph instrument, the combination of a single main line, a rotating unison-arm, a unison armature-lever, and a retracting-spring which can only withdraw said armature upon a prolonged cessation of current, and whose'tension is only overcome by a prolonged current, a unison-switch for breaking the main-line circuit to permit the retraction of said unison armature-lever, and a transmitter placed in said line for sending a series of electrical impulses to line, as and for the purpose described.

3. Ina printing-telegraph instrument, the combination of a single main line, a rotating unisonarm, a unison armature-lever, a retracting-spring therefor, so adjusted that said armature-lever will be retained attracted to the cores of its electro-magnet under the influence of short as well as prolonged electrical currents, and will remain retracted under the influence of short electrical impulses, and will be attracted from its back position by a prolonged impulse only, a circuit-closer for sending short impulses, and a manually-operated device to break the main circuit to effect a prolonged cessation of current, and to close it to send a prolonged impulse.

ADOLPHUS A. KNUDSON.

WVitnesses:

\VM. ARNOUX, S. S. WALTERS. 

